Definitions for "Spring Line"
Additional docking lines used to prevent the boat from moving
A pivot line used in docking, undocking, or to prevent the boat from moving forward or astern while made fast to a dock.
docking lines that keep the boat from drifting forward and back
The point at which an Arch sits on its support columns
A horizontal line which intersects the springing.
For minor arches the line where the skewback cuts the soft it. For major parabolic arches, the term commonly refers to the intersection of the arch axis with the skewback.
Point in a unit at which a straight element transitions into a radiused element. Where multiple radii are employed, the transition between each radiused element is referred to as a spring line.
Keywords:  squall, rigging, weather
Rigging Squall Weather
A mooring rope oriented at a small angle to the ship's centerline.
Theoretical center of a pipeline. Also, the guideline for laying a course of bricks.
Keywords:  curve, door, begins, frame, window
The point in a frame where the window or door begins to curve.